The original Mfgs wood would be easiest to recommend but even then, it may have been the cheapest to use back then. They were all cheap compared to now. Mahogany has been a traditional marine wood as well as White Oak and of course Teak. I'd guess Mahogany because it was plentiful and cheap. The make up of Mahogany allows it to absorb resin better than Oak. Also, depending on what you're constructing, you can seal the exterior surfaces and leave the interior surfaces raw wood which allows it to readily dry out if it's in a large well circulated area. Of course if it's in an area that needs to be sanitary looking, seal and paint it.
Paul,
PT wood, is it all D. Fir/Pine that's pressure treated or do they ever use hardwoods.